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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income (Loss) Attributable to Parent [Abstract]
Net earnings attributable to Kirby	$ 2,777	$ 47,987	$ 47,287	$ 44,296	$ (24,437)	$ 41,816	$ 28,602	$ 32,471	$ 142,347	$ 78,452	$ 313,187
Undistributed earnings allocated to restricted shares									(369)	(324)	(2,213)
Income available to Kirby common stockholders - basic									141,978	78,128	310,974
Undistributed earnings allocated to restricted shares									369	324	2,213
Undistributed earnings reallocated to restricted shares									(369)	(323)	(2,211)
Income available to Kirby common stockholders - diluted									$ 141,978	$ 78,129	$ 310,976
Shares outstanding [Abstract]
Weighted average common stock issued and outstanding (in shares)									59,905,000	59,804,000	55,702,000
Weighted average unvested restricted stock (in shares)									(155,000)	(247,000)	(394,000)
Weighted average common stock outstanding - basic (in shares)									59,750,000	59,557,000	55,308,000
Dilutive effect of stock options and restricted stock units (in shares)									159,000	132,000	53,000
Weighted average common stock outstanding - diluted (in shares)									59,909,000	59,689,000	55,361,000
Net earnings per share attributable to Kirby common stockholders [Abstract]
Basic (in dollars per share)	$ 0.05	$ 0.80	$ 0.79	$ 0.74	$ (0.41)	$ 0.70	$ 0.48	$ 0.54	$ 2.38	$ 1.31	$ 5.62
Diluted (in dollars per share)	$ 0.05	$ 0.80	$ 0.79	$ 0.74	$ (0.41)	$ 0.70	$ 0.48	$ 0.54	$ 2.37	$ 1.31	$ 5.62
Antidilutive securities excluded from computation of earnings per share (in shares)									187,000	384,000	472,000
RSUs [Member]
Net earnings per share attributable to Kirby common stockholders [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)									0

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